zed1015 wrote: Must have been very cold/ damp to cause that but slight brown staining shouldn't have done anything.
As regards the cause ,who knows ? without pulling it apart but If it runs ok otherwise I would give it a chance and do a few hundred miles and see if it settles.
20 miles isn't enough for a determination unless something drastic happened.
I'm thinking the same thing, but know deep down it will never be 100% without hone, pistons n rings, again.
The advantage would be getting the carbs tuned, and figuring out my mystery intermittent no spark issue, before doing the top end again.
Disadvantage is dirty oil, and carbon build up in the head.
Right now I see blowby smoke out the breather, but not the exhaust. But there's already carbon on top of the pistons after 20 miles.
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